The days of sneaking off for a smoke are over when you make the switch to electric cigarettes
. You can enjoy them literally anywhere. They are no more harmful to coworkers than if you were chewing a piece of gum next to them. There is no need to be concerned about disturbing or offending your friends or the people at the next table when you use an ecig. While you enjoy the nicotine that they deliver, the people around you won't have to worry about second hand smoke.